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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea60a57a4c6bccade1b0396685553e7102565bb48768a5d9c0c3c92a2a979d1' 
  AND token = 'hv5G+B0nwf4TnEukAKQEdyLBRFKGYGUDkBQBfGS5DDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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