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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9298136660479a6e22832f5e524a089b324fb44a5be196e02a271b05177e4d1' 
  AND token = 'Lch+RiGVvKLYbaFRgY4YlYeIsyXEeAy15h7VSE5FPCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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