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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe0647d4f4f6aa5e0efee7ed7773a762f6c361a24a54ef5e99dc5e99085775a' 
  AND token = 'BjYixXxL0VeeEET/IQFOOCrRZvmyIa8RtN3gKfoNHPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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