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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c594b8610872c2aea49808e4928ce9fde2d62564c2e7105683e415c06c2b9a' 
  AND token = 'On6+IznjmlSfB39zS/00+hIR5C2whS5N2PPS4Lsi3Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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