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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbffe65ba372b1db9669ce66a857e1c0f7933a2b7f574e6453d5bebea5f51c12' 
  AND token = 'Fnk1PvF8Y0ptI8h7o6swCnyinr+jXYwFuNDiPEiK0Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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