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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523320f6d301d5df3ac90c15baeb3d51b617ca2dee21246e0dd327a96e85e7ab' 
  AND token = 'ybPCwFEtqH4cdfdUHNGkzCA4z/DrAmrlEu6q4F5mT1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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