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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973072861d950f98f0c3eebe2c56b391ea3fa34697c2223899aa063c23903f20' 
  AND token = 'uoB8JKyqy9Jp7FCQ0OxRjcn1cVN89pEN+bl1cpUsCw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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