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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4bf6969da3185664a1e0bc55ba2483511a115300a4eb960e907d40ffa1ead0' 
  AND token = 'ws5uRosL5D9Blu0GlU38uvQHvZehUohnQFPRNPCPI3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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