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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c1d2fde688c7b466bbc64c9a0637c410103ab17df523273e4498c6bb966458' 
  AND token = 'hvMrgGFAhDGEYfH9uSW8Gac0j8bOIJrDzHn1mkO13NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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