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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b990c7b68201a1f1facf87c0490e532060992f88e3e4d1db18580cd88d79ee0' 
  AND token = 'vk60CeYuqnbdTHWEsryHkCvkkE1I96DgF0B3kzX5/ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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