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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa86b6bd1d211f13df9ae7dfba86412a3ad9a1ca87bb5b5c64d1003c43f52bd' 
  AND token = 'hl7IgG8YA3wbTAcJTuITlnbLAPZHJUIe2FP6paAOc3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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