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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f974e16d22ff82ad4ebf1c08be0deb88f4c08ec838e22b469cc35a534652036f' 
  AND token = 'VrBd883y9JR4AnhO4v5Gj2HlXduW9hDPoZW0k0u27/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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