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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1a06ec49b696297e80e23b782c4a9dc7db9681c42160c7d87ac58cf53d6dd9' 
  AND token = '+i4E7oDgZW0MhmYErVVOVldbUPcHIybOoSCyWXeBCBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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