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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620e366422c4da29e8b8dcd3768b05529c4ef520cc3f33526b3cb2172e4a0d2a' 
  AND token = '+660l7uaVqMunTKF55lwbviLz7JG2CiAygxf6VyylaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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