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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2786997f759d5466edaafd4a7e659c94e4a66bea52a11a6c6b45aced761c75de' 
  AND token = 'C4Di7lgW8IY6NL1KjBKKzb/YiwN3/pHPly1hA1vGsVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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