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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a93bd05aae4664608d0bcf9c55d3a22c5fd44fa0813ad336ccf0df14021f5e4' 
  AND token = '7bu8TZlSFTWuJc1kgbLuU6XCj5P8NWMB3zs6wlWjOsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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