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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a495c5986cfb3e8bb993c27298a5c91d2a570a571cb47c8c9f1b38b7e8ee8ce8' 
  AND token = 'R12iUuAw3ammf5g+NoZp4DDCGE4Y+G8ctATnoqhoGOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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