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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f2066e9c38393f79587dca4786d1b3c2f0859106ed14737d0337aaea7beda0d' 
  AND token = 'kp047fcqFKP++EzwlbGfzRONKue8kqoA3p68FfPzQ3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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