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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e41490b887166f8d5aca6e0827a4840b41e93fad2557c1840c36dc0b2f30c1d3' 
  AND token = 'wnEADtP0d3XlmbTN9XQrCjsMAta8EyS+N72Nv58Oxpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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