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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63bd435d69386f3171f6fa6437d5594c3d4447a65ab608920e3928ac3dc36c94' 
  AND token = 'Q7acVDCgTkCxS/P1xFIC3Vs+U/RB8b1c1MYWT4QmfeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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