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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7259d6946e3913cff4845c99558ecf40793e9f3c37c3d091525313e941aec4e' 
  AND token = 'E8ueGbGSxPNFxTN4kE0LOkKY7TfxoXK+BTIa4Z3mnNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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