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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b55d7700961982915e79dde3daaa234cb41ab713df02636cb94251fae7f8b70' 
  AND token = 'vaFGp2dFY/2m0zLLGC8p+9ngcJ3umVlkf7rDulAQSSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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