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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057443661627750a395c154ee71b315085e7281d80dae92cc0298f83883d5800' 
  AND token = 'dTDm1WGujljecJhITa4kk5i2lW9VEYbQE72oRdzpO3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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