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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7952a1af2324a9e50ba98008e942a64308b31e9cd11fb3df9e0d088ba895fbaa' 
  AND token = 'YyDNrO0HQZNG202J+oKXkd9IvfhaI+rw4Vcc15sBvzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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