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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'def36d9a5ef2d434b700f31ffc283ce734f4cda24808af67906905311d18381f' 
  AND token = '5IZZ46wodGM0Jya6aemTjBs2tCzoT3eE6NjEeOehlkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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