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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc15d0489a2b04c8c955b36caab4d7e1628e79c501513e1ca2be897627bda918' 
  AND token = '2TmRaYzCyBfPO0O2GVImSMqubTaaCOyb32z++LMvj7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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