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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a32993f67d411a366ad447de915c86b246acd5d07dd96c4933bc3f3a72475fa' 
  AND token = 'VWfdBTgXFnTyQ31dwvi+kRak2PQM+F+EHdSiPUmanyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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