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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '841bbe9e1e0cc0c1f11c30744290dd49c5bb96863f9950ecfcf313084a841abc' 
  AND token = '6Bbb30ehhfzqJOsldLdM2IZGgpVpW6i92BITkk176bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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