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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af9ae591f4460fd295808a1b8b4673fe79b65a69aafb2d699010d51ce024692' 
  AND token = '84/WLF5bAbtmHmHIIeHRuj7X/brjNqEQIWiZjpMCmP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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