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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc4f74a77684f19c535dab3f7abbe7c0db503b6f273770ed664e571e45b02bd' 
  AND token = 'MFnDhqdlr0a4RbWxcEyQ4DMb6HMiJQlJBtw+6popsWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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