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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b802ce2e315756de277c4391f1d83075f324e3b6cb321222b08b22e80e5ea697' 
  AND token = 'xbSdI5SORjV7Jz1EoJk/V6qXgow1TE10kcN3XIeYa3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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