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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f3a5172d77cb625c7d7d7b67729d05f329b5ffe3208d7662cf589584171509a' 
  AND token = 'RpnVabOB3B4RWEMHl2jGR69eiv7kjFzA3OC7uDgFwtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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