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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d666aca7e6f629a64005497dc74de81877009ecc1d25155bf6a193375ca39b' 
  AND token = '7+yp8HNLsxmqwSEBMEcell1ECuFDCx1zos2EQgutxTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}