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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7aba89a48e8fecba18fcc8f4c003972ba9242b28b89d70600d3c14190e6d9e' 
  AND token = 'qNkK0P58LNNTrjlfR3TcCwrueq+K2QPyD1rcNVZJKQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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