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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7594276f476b54ca6a89639448c6aaabc0dd5d35b01bec48749aec4750cdbb0e' 
  AND token = '9nl1pmT6h3qwzZ4Rn5DSsXNnvlOOG4qm91brI9HK55g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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