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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a62b7bbbc12b376c3bb8f94c4194e04b34d6be65a6b4ce1a0c1eb0eefadc8fd8' 
  AND token = 'McfmhSwWc2oLXPIoPDMX6mo2GE6SqVg+297zXVt/59k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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