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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3874199406823c0b10f252a39ecfc298e2645cacc03f482b7e731da617208813' 
  AND token = 'yL+M3X3kSNsU8F3lzBO2WUP3dvEzUpuUIKGOV9rK7LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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