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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa85e262146a2fe2d3538b58fe3f26f6e14582ee3c834740a15b862c102ca647' 
  AND token = 'X5SvXm/qeKa8ZTNPRnvtdkiuNSDSknMnGBnbrCJwP4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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