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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1c2e985e0499d72f70d0ee3935c67881505b374127979d8ee3f9e235955645' 
  AND token = 'wI2gs7kSHNWxyvnR3LYtHII4UQZhpVLajkb7fsCuP8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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