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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e091c83a318f8a1c8d517f3ddaf554408adbc3e971b9683f22b74398eace7a78' 
  AND token = 'f59Kt0xYmjp1LbkmyYAhbjTUd/ph/nFGCj/DhUXaaSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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