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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e619d0722af77c1e756a82b7bb37a075b8711e50e5c9915597306f2b600e93' 
  AND token = '0Np5fgEas4ZjtVWFxHABso4F03U6GIj6hCBEnJCO0Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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