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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90546ce7bf55b195d7e5d9f6face03ece0104b614ed291caa378a4f9bce6a926' 
  AND token = 'D70mxx5Q0NMLJKyPUI2K9ChFCDG3YzzQx9ynfsM+34c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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