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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79529f3baae8c6ee40c1305cbe88560b75f8cd1aa2f0a25990ff89f21c19ec83' 
  AND token = '5BU1x8frXQE4AmVk9M5Euc0gNt4QIcw6SMIkg/NoqUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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