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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08bba77eb1ec58431276cd4f4572ecfec4d7f97701f53bda980b62af2c1156aa' 
  AND token = 'bg+9WPR2EMuAVElT0EtQjHs8X4D2+MB/zGAMA0TKYmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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