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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8f5efac3d1d2ae0a54446cf3b64a1352417ec652fcf4fd3d2e6de1ef53cedd' 
  AND token = 'J/8aaOKrraMxRY4eCyqALB8wQwxJ0CLTKalu2Tx0+Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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