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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e43a84d968688083257727556dd21a9b9fe752f3bf8e334305b1c407184ef98' 
  AND token = 'zKbHzLMY4lkeAUHdCNxAU5RsVfxYbP90/q5lRvPMzk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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