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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e249a28eeb4c091bab5ba828609a7e8de8540758556b485a13c54175d7dd69' 
  AND token = 'avXy93YEMRLNbhtGW2dUEH+9bp4Boi2XrHofpTnm6PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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