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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef2cb2e9be2166220c979202e23c10cdc2a2db28830a4584cee24a4aa036ad5' 
  AND token = 'Tl2DUV04m+JevPOvOjTbO9Nz1DykuvMHku9DChpi+HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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