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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67bb1ab04584bb555137675db3e468030691709f476755311b8b3262f4f18f85' 
  AND token = 'W7hCSmi6QVDPBam4h2ZsDMuIVYfxypF2McZEaq3qX/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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