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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294db662562b913f1081c8a09e2b91eaceb205656a5b2b8fec526269ee7bee28' 
  AND token = 'pXVUIC/Oz9mpiA1R5i/ftJDxv2F4sTV3uPZWn5aBkTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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