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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '159c3beada92a0910c9d4074ccbc5ed3a46201f5cfc33d5ef92b1c23cd8dc8b3' 
  AND token = 'oFfVeAd62XHdRCvGdA9RYSz84LPe/82yig/NdzjwgU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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