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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955c5e236430c330be99f43d7a48336719f71ef8ad7743d1981b1c6c307076c6' 
  AND token = '4jXt2HYIvopALSK/kI7/KtvO0bg/D/CqnfGEVthe0Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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