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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc0c96ea1beebac0abc6ab08ec4eef7eaa99fec0d6950628207435f411dd1f9' 
  AND token = 'Ue4qZS+oFDX9S3SMuaDDvmpOdyxjlc+hbNMIRYmA+6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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