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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f5f5a617f9ce2998ec2fdd8fb0187a036dcc70bdcc16d1eb134d89ecb03979' 
  AND token = 'ScgxpEtDMjRueFajHeJuFPpYmOAD7k9niC+lWYt9/PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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