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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b88117d51faf8c47041fb5cadcc9c9374387e52acfccb3a6d097ef5f0971cf' 
  AND token = '63/BJeWiQGA7Ubt5sEOnH84o6KibCns8J7ShuHNZrMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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