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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc0ccb2064e48214f44d973f1e8aed0611a62ef687b549071ea76d4f30503c6' 
  AND token = 'b/I+6Hl/nZHMIe3/sCQfd3ce4n786KkHv4vVNIutOPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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