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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78c58a2c0de33822403ae0971b382fe7bad0e47f7bbe0ef4d4d4586434d3d94c' 
  AND token = 'ya7znrXgeminFOW8FbbBCk+GGD5x8Nyaig1XlJILUbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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