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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb94dec3b70eba3a0f081f89a6559ff03a26fa95259a707ea9295dd254f7c1c' 
  AND token = 'SwM5Ujbk+HsCJ4rVGkK9Kr+VFJNiPKhCf24sH9gxJPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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